Realize this topic is rather old. Still, wanted to chime in....
Methinks what turns one on/off is 1) personal taste and 2) age. Some guys like big tits, others like 'em small. Blonde hair for some, orange/green/purple for others. I'm old and rather "traditional." Others are young - and not.
Major turn ons:
- BLUE eyes
- Hair color doesn't matter as long as it's relatively "natural".
- Small tits and petite bodies.
Major turn offs:
- Unpleasant music
Admittedly, as a male from another generation, it's becoming harder to find models which turn me on.